This extension is used to define visible properties on managing Plesk hosted objects. If you send a request packet containing the get-physical-hosting-descriptor operation, the service node, or one or several level nodes in preassigned order nested into the extension node will set if a property is visible when you manage a specified object. The extension node of physical hosting property can be represented graphically as follows:

This part of a physical hosting descriptor represents the service property asp visible when managing webspaces, subdomains and web users in Plesk for Unix.
<property>
<name>asp</name>
<type>boolean</type>
<writable-by>admin</writable-by>
<label>__asp_unix_support</label>
<extension>
<service>
<domain>1</domain>
<subdomain>1</subdomain>
<webuser>1</webuser>
</service>
</extension>
</property>
This part of a physical hosting descriptor represents the non-service property fp visible when managing webspaces, and the non-service property ftp_quota visible when managing webspaces and subdomains in Plesk for Unix.
<property>
<name>fp</name>
<type>boolean</type>
<writable-by>none</writable-by>
<label>__fp_unix_support</label>
<extension>
<level>domain</level>
</extension>
</property>
<property>
<name>ftp_quota</name>
<type>bytes</type>
<writable-by>none</writable-by>
<label>__hard_disk_quota</label>
<extension>
<level>domain</level>
<level>subdomain</level>
</extension>
</property>
For details on hosting settings, refer to the section Managing Subscriptions > Subscription Settings > Limits, Permissions and Hosting Settings.